Over the years, Americans have become increasingly exposed to extremism

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By James E. Hawdon, Director, Center for Peace Studies and Violence Prevention, Virginia Tech. A man sporting a Nazi tattoo leaves Emancipation Park in Charlottesville, Virginia on Aug. 12, 2017. Steve Helber/AP Photo Extremism has always been with us, but the internet has allowed ideas that advocate hate and violence to reach more and more people.…